This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A036287 #20 Jan 14 2024 08:06:59 %S A036287 7,63,4095,16777215,281474976710655,79228162514264337593543950335, %T A036287 6277101735386680763835789423207666416102355444464034512895, %U A036287 39402006196394479212279040100143613805079739270465446667948293404245721771497210611414266254884915640806627990306815 %N A036287 a(n) = ((2^(3*(2^n))) - 1). %C A036287 Also "Denominators for Fibonacci Binary Verticals viewed as Periodic Binary Fractions": The cycle of bit-n of Fibonacci numbers in binary is (3*(2^n)). Looking from top to bottom they can be viewed as non-finite periodic binary fractions, with each fraction computed as the n-th element of A036286 divided by the n-th element of A036287. %H A036287 Antti Karttunen, <a href="/A036284/a036284.c.txt">C program related to this sequence</a> %t A036287 2^(3 2^Range[0,10])-1 (* _Harvey P. Dale_, Jun 19 2011 *) %o A036287 (PARI) A036287(n) = ((2^(3*(2^n))) - 1); \\ _Antti Karttunen_, Jan 14 2024 %Y A036287 Cf. A036286, A000045. %K A036287 nonn,frac %O A036287 0,1 %A A036287 _Antti Karttunen_